(Updates to U.S. trading, adds bylines, changes dateline to New York; previous London)

* Dollar up before start of Federal Reserve meeting

* Oil dips on report of rising stocks, Saudi output jump

* Wall Street opens lower as energy shares weigh

By Lewis Krauskopf

NEW YORK, March 14 (Reuters) - Oil prices tumbled on Tuesday, weighing down energy shares in the wake of a report of rising crude stocks, while the U.S. dollar strengthened ahead of an expected Federal Reserve decision to raise interest rates.

Oil prices slid to three-month lows after OPEC reported a rise in global crude stocks and a surprise jump in production from its biggest member, Saudi Arabia, despite output curbs by the group.

The Dow Jones Industrial Average fell 61.83 points, or 0.3 percent, to 20,819.65, the S&P 500 lost 11.95 points, or 0.50 percent, to 2,361.52 and the Nasdaq Composite dropped 34.86 points, or 0.59 percent, to 5,840.93.

The U.S. Federal Reserve said it would hold a policy meeting as planned on Tuesday and Wednesday, even as a snowstorm hit Washington.

With the central bank widely expected to raise rates, the focus is on the pace of future hikes.

“The big question is ‘does the Fed become even more hawkish and point towards the possibility of more than three rate hikes?',” said Constantin Bolz, head of currency strategy at UBS Wealth Management in Zurich.

Investors also are assessing the potential outcome and impact of a gathering of G20 finance chiefs, U.S. President Donald Trump’s first budget and a tense election in the Netherlands.

The dollar rose 0.2 percent against a basket of key currencies, bolstered by the Fed’s expected interest rate increase and by political risks in Europe amid Dutch and French elections that have pressured European currencies.